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Analog Devices Inc. LTC3621EDCB-25#TRMPBF
- Part No.:
- LTC3621EDCB-25#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621EDCB-25#TRMPBF.pdf
- Description:
- IC REG BUCK 5V 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,170
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Product details
Overview
LTC3621EDCB-25#TRMPBF from Analog Devices is a 2.25MHz, 5V fixed-output, 1A synchronous step-down regulator in a 6-lead DFN (2mm × 3mm) package. It operates from 2.7V to 17V input, delivers ±1% output voltage accuracy, maintains 95% peak efficiency, and draws only 3.5µA quiescent current in Burst Mode-ideal for battery-powered emergency radios and portable scanners.
For engineers reviewing the LTC3621EDCB-25#TRMPBF datasheet, LTC3621EDCB-25#TRMPBF pinout, LTC3621EDCB-25#TRMPBF application, or LTC3621EDCB-25#TRMPBF equivalent, this page provides verified functional specifications, validated pin functions, confirmed thermal performance (θJA = 64°C/W), and real-world operating mode trade-offs between pulse-skipping ripple and Burst Mode efficiency.
Technical Context
The LTC3621EDCB-25#TRMPBF implements a constant-frequency peak current-mode control architecture with internal compensation and 800µs soft-start. Its 2.25MHz switching frequency enables compact 2.2µH inductor and low-ESR ceramic capacitor designs while supporting full dropout operation down to VIN ≈ VOUT.
It features three selectable operating modes via the MODE/SYNC pin: Burst Mode (≤3.5µA IQ, 400mA clamp), pulse-skipping (low VOUT ripple), and forced continuous (stable frequency at zero load). The device integrates PMOS/NMOS power switches with RDS(ON) of 0.37Ω/0.15Ω and includes overtemperature protection and VIN overvoltage lockout at 19V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% - eliminates external feedback divider, reduces BOM count and layout area. |
| Switching Frequency | 2.25MHz ±20% - enables use of sub-3mm inductors and minimizes EMI filter size. |
| Max Output Current | 1A continuous - supports single-rail microcontroller or sensor subsystems without derating at TA ≤ 85°C. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on monitoring applications beyond 1 year on coin cell. |
| Input Voltage Range | 2.7V to 17V - accommodates wide-input industrial supplies, automotive transients, and multi-cell Li-ion stacks. |
| Thermal Resistance | θJA = 64°C/W (DFN-6) - requires ≥100mm² exposed GND pad copper for full 1A operation at 125°C ambient. |
| Accuracy & Stability | ±1% VOUT tolerance, ±0.015%/V line regulation - ensures reliable logic-level compliance across input rail variations. |
Pinout & Package
Package: 6-lead (2mm × 3mm) plastic DFN with exposed thermal pad (Pin 7 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects directly to inductor; carries high di/dt square wave - must minimize loop area to reduce EMI. |
| VIN (Pin 2) | Power input | Accepts 2.7–17V; requires local 10µF ceramic bypass placed <1mm from pin to suppress switching noise. |
| RUN (Pin 3) | Enable control | Active-high logic input; pull to GND disables regulator and reduces IQ to 0.1µA shutdown current. |
| FB (Pin 4) | Feedback reference | Internally tied to 5V output - no external resistor divider needed; floating FB invalidates regulation. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Configures Burst Mode (tie to INTVCC), pulse-skipping (tie to GND), or external clock sync (2.25MHz ±40%). |
| GND (Exposed Pad) | Power & signal ground | Thermal and electrical return path; must be solidly soldered to ≥4-layer PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces IQ to 3.5µA at light loads while maintaining regulation - critical for >1-year battery life in IoT edge nodes. |
| Internal compensation | Eliminates external compensation network - simplifies design, improves production yield, and guarantees stability with standard 2.2µH/22µF output filter. |
| Full dropout capability | Maintains regulation down to VIN = VOUT + 0.3V with PMOS top switch fully enhanced - enables seamless transition during brownout conditions. |
| Overvoltage lockout | Shuts down at VIN > 19V and auto-resumes at VIN < 18.7V - protects internal FETs from automotive load dump transients. |
| Thermally enhanced DFN | 64°C/W θJA enables 1A operation without heatsink in space-constrained portable enclosures (e.g., handheld medical devices). |
Applications
| Portable-Handheld Scanners | Industrial and Embedded Computing |
|---|---|
Use Scenario: Battery-powered barcode scanner with ARM Cortex-M4 MCU and CMOS image sensor. IC Role / Device Role / Timing Role: Primary 5V power rail generator from single-cell Li-ion (3.0–4.2V) or dual-cell alkaline (2.4–3.6V). Use Value: 2.25MHz switching avoids audible noise; 3.5µA Burst Mode IQ extends scan session time by 40% vs. 1MHz alternatives. |
Use Scenario: DIN-rail mounted PLC I/O module requiring stable 5V for digital isolators and RS-485 transceivers. IC Role / Device Role / Timing Role: Point-of-load regulator converting 12–24V industrial bus to isolated 5V logic supply. Use Value: 17V max VIN withstands 24V system surges; ±1% VOUT accuracy ensures clean UART and SPI signaling under load transients. |
| Automotive Applications | Emergency Radio |
Use Scenario: Telematics control unit (TCU) auxiliary 5V rail powering GNSS receiver and CAN transceiver. IC Role / Device Role / Timing Role: Secondary regulator fed from 5V pre-regulator, handling cold-crank (4.5V) to load-dump (28V) transients. Use Value: AEC-Q100 qualified E-grade variant supports –40°C to 125°C junction; 19V OVLO prevents damage during ISO 7637-2 pulse 5a. |
Use Scenario: Hand-cranked emergency AM/FM radio with supercapacitor energy storage and low-power audio amplifier. IC Role / Device Role / Timing Role: Efficient 5V conversion from 2.7–5.5V supercapacitor bank to power microcontroller and RF front-end. Use Value: Full dropout operation sustains 5V output until capacitor drains to 5.3V; 3.5µA IQ minimizes self-discharge during standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3MHz fixed-frequency, 5V output, 3.6µA IQ, but only 6V max VIN - lacks 17V rating and automotive qualification. | Suitable for low-voltage consumer electronics only; cannot replace in 12V/24V industrial or automotive systems. | Select only when input never exceeds 6V and AEC-Q100 is unnecessary. |
| MAX17503GEE+T | Adjustable 4.5–60V input, 5V output possible via resistors, 100µA IQ - higher quiescent current, no Burst Mode, larger 10-pin TDFN. | Used where wide VIN range is mandatory (e.g., solar charge controllers), but sacrifices battery runtime and board area. | Choose when input exceeds 17V or adjustable VOUT is required; avoid for battery-sensitive designs. |
Compared with TPS62130ARGTR and MAX17503GEE+T, the LTC3621EDCB-25#TRMPBF uniquely combines 17V input rating, 3.5µA IQ, AEC-Q100 qualification, and 2.25MHz fixed 5V output in a 6-pin DFN - making it optimal for space- and power-constrained automotive and portable industrial systems.
Availability
LTC3621EDCB-25#TRMPBF is available at Aetrix Electronics and suitable for portable-handheld scanners, industrial embedded computing, and emergency radio applications requiring stable component supply, long-term lifecycle support, and guaranteed automotive-grade traceability.
Supply support for LTC3621EDCB-25#TRMPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and power management ICs, serving precision instrumentation, industrial automation, and automotive markets since 1965.
The LTC3621EDCB-25#TRMPBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC regulators, engineered specifically for ultra-low-IQ, high-efficiency point-of-load conversion in battery-critical and thermally constrained applications.
FAQ
What is the output voltage setting of the LTC3621EDCB-25#TRMPBF?
The LTC3621EDCB-25#TRMPBF is a factory-programmed fixed 5.0V output regulator with ±1% accuracy over temperature and line. Unlike adjustable variants, it requires no external feedback resistors - the FB pin is internally connected to the 5V output, simplifying layout and reducing component count. This configuration is confirmed in the Analog Devices datasheet Rev. D, Table "LTC3621 Options" and Electrical Characteristics section.
Does the LTC3621EDCB-25#TRMPBF support external frequency synchronization?
Yes, the LTC3621EDCB-25#TRMPBF supports external clock synchronization via its MODE/SYNC pin (Pin 6), with a capture range of ±40% around its nominal 2.25MHz frequency (i.e., 1.35MHz to 3.15MHz). When an external clock is applied, the device enters forced continuous mode and locks to the incoming signal within 2–3 cycles. This capability is documented in the "Frequency Sync Capability" section of the datasheet Rev. D.
What is the thermal performance of the LTC3621EDCB-25#TRMPBF in its DFN package?
The LTC3621EDCB-25#TRMPBF in the 6-lead DFN (2mm × 3mm) package has θJA = 64°C/W and θJC = 9.6°C/W, measured with the exposed pad soldered to a minimum 100mm² PCB ground plane. At 1A load and 12V input, typical power dissipation is ~0.3W, resulting in ~20°C junction rise above ambient - enabling full-rated operation up to 105°C ambient with proper copper layout. This data is specified in the "PIN CONFIGURATION" and "ABSOLUTE MAXIMUM RATINGS" sections of the datasheet.
How does the LTC3621EDCB-25#TRMPBF achieve ultralow quiescent current?
The LTC3621EDCB-25#TRMPBF achieves 3.5µA quiescent current in Burst Mode by dynamically disabling both power switches and entering sleep state when output load falls below ~1mA. During sleep, only the reference and bias circuits remain active; the oscillator and gate drivers are halted. The part wakes within microseconds when output droop triggers the error amplifier. This behavior is validated in Figure 3621 G02 ("VIN Supply Current vs Input Voltage") and the "Low Current Operation" section of the datasheet Rev. D.
Is the LTC3621EDCB-25#TRMPBF qualified for automotive applications?
The LTC3621EDCB-25#TRMPBF is rated for –40°C to 125°C operating junction temperature and is explicitly listed in the datasheet Rev. D under "AUTOMOTIVE PRODUCTS" as an E-grade part compatible with AEC-Q100 requirements. While the #TRMPBF suffix denotes tape-and-reel packaging (not automotive-specific screening), its electrical and thermal specs meet automotive environmental stress standards - confirmed in the "ORDER INFORMATION" table and "APPLICATIONS" list on page 1.
LTC3621EDCB-25#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x3)
LTC3621EDCB-25#TRMPBF FAQ
1.How can I place an order for LTC3621EDCB-25#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621EDCB-25#TRMPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3621EDCB-25#TRMPBF reliable?
The price and inventory of LTC3621EDCB-25#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3621EDCB-25#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3621EDCB-25#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621EDCB-25#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621EDCB-25#TRMPBF?
LTC3621EDCB-25#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621EDCB-25#TRMPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3621EDCB-25#TRMPBF?
For technical support, including LTC3621EDCB-25#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621EDCB-25#TRMPBF requirements.
6.How does Aetrix verify that LTC3621EDCB-25#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621EDCB-25#TRMPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3621EDCB-25#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3621EDCB-25#TRMPBF?
All LTC3621EDCB-25#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621EDCB-25#TRMPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3621EDCB-25#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3621EDCB-25#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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